Telephone system.



G. S. WINSTON & E. H. RUPE. TELEPHONE SYSTEM. APPLICATION FILED DEOJIQ, 1904.

Patented Oct. 10, 1911.

lllllllll :8 '4 llllllm H 1 Jbu U11 W T OFF CHARLES s. WINSTON AND EDWIN n. RUPE, or GHICA'GQ; ILLINOIS, ASSIGNORS TO KELLOGGSWITCHIBOARD & SUPPLY COMPANY, OF CHICAGO, ILLINOIS, A. GORPORA' TION OF ILLINOIS.

TELEPHONE SYSTEM.

A ncama filed December 19, 1904. Serial. No.- 237,363.

systems, whereby the same cord circuit is adapted for use with varioustypes ofytelephone lines, and particularly with magneto common battery signaling and common bat-.

tery talking lines. 1 V

In small installations-it-is often desired to terminate upon the'same board lines of the magneto andcommonbattery type and possibly still other types, this most often occurring in connection with old installations to" which new and improved additions have" been made, the additions being of the later and improved. types.

In order to enable any of the operators, before either the old or the new parts of the board. to connect with any of such lines, it is necessary that the multiple I sections of the lines be extended through both the old and the new portions of the board. Heretofore it has been most common to provide all operators with the different types of cord circuits necessary to be used with the different lines, or to provide additional apparatus of some type in connect'ion with the operators outfits so thatad- I ditional laborwas imposed upon them to make the connections between the two or more kinds of lines. n

Our invention 'has for its object the simplification ofthe operators cord' circuit by means of which the same cord circuit having only the usual answering andcalling plugs may be used interchangeably with any-of the different lines and withoutany difierence in the mode of establishing and completing such connections, thus rendering it unnecessary for the operator to know and keep in mind the different types of lines that appear before her. the invention results in more efficient service than heretofore and as will appear herein after, savesconsiderable complication of relays and other apparatus ordinarily asso- ,ciated with such circuits.

'Our invention is illustrated in the ac: companying drawing in which the figure is It is obvious that with magneto common battery signaling but lOcalbattery talking and common battery talking lines and with cord circuits of our improved type which are adapted for use with such lines." I A In the figure L is a telephone line of the ina gneto type, L? is of. the common battery signaling type,- while L and L ".are telephone lines of the common battery talking yp -q a a In the case of line L the line wires 2 and 3terminate at the sub-stations in the usual devices, comprising a switch hook 4 upon which the receiver '5 isadapted to be sus the receiver is 'taken up suitably connects the transmitter 6, the local battery 7 and the primary of the subscribers induction cod 8 in a localcircuit, and the said receiver and secondary of said induction coil in .the circuit of the telephone line. Normally said hook connects the line wire 3 through the signaling bell 9, a condenser, and'normal contacts of the hand magneto generator 10 to the other side of the circuit. At the central oflice the line conductors 2 and 3. are normally connected through the contacts of thecut-oii relay R with the line signal S, the forward or alternate contacts of saidcutw-ofi relays being connected with the tip and sleeve springs 11 and 12 of the springjack J of the line. The said cut-0E relay is" connected upon one side by conductor 13 with thedive pole of the central common battery B while its opposite terminal is joined through the medium of conductor 14 with the normally-open spring 15 leading from battery B while line con-- ductor 3 is normally grounded, The line relay controls the local circuit of the line with the grounded spring or contact 16 of i I signal S which is preferably a "small incandescent lamp. 1

The line conductors 2 and 3 of the common battery lines L and L terminate at the substation in. the usual devices adapted for common battery transmission; including the switch hook 4, which normally completes a path for ringingcurrent through the call 7 bell or ringer 9 and a suitable condenser '21,

and which when the receiver 5 is lifted therefrom completes a path for battery current through the transmitter 6 and said receiver. It will be understood that this arrangement is intended. merely to typify any usual or desired common battery arrangement. At-

the central office the line wires 2 and 3 are normally extended through contacts of the cut-01f relay R tojoppositepoles of thebatteryB, and include in circuittherewith the line relay R which controls the local circuit of th line signal S which is preferably in the for of a small incandescent lamp. The switchboard section of the line is extended from the forward contacts of the cut-0E relay R of the springjack contacts 11 and 12 of jacks J The winding of the cutwfi rei answering plug P and a calling plug provided with tip, sleeveand third contacts adapted to register respectively with thetogether through themedium of flexibletively the relays r and r lay is legged to ground from the sleeve side of the switchboard section of the line;

The multiple jacks of the lines L and L are not completely shown in' the drawing, but are indicated by the -branching linesextending beyond the answering jacks, and ity is understood they are of the same type as the said answering jacks. I The cord circuit which is adapted for use of these various lines is provided with an corresponding contacts of the springjacks,

such as J and J, of both types of lines. The

tip contacts 29 of said plugs 'are connected strands t' and t and the interposedcondenser 0, while' their sleeve contacts 19 are similarly j oined by the strands s and sflan'd the interposed condenser 0 The third con tacts p of said plugs are connected by the similar strands 0 and o to the live pole of the battery B these strands containing respec- A pair of supervisory relays, 7 and r are associated with the answering end of the cordcircuit, and

suitably control the local circuit of the superlow resistance winding of relay r is connected on on e'side to the grounded ole of the battery B and upon the other side by cond'uctor 24:, the/normal contact and spring 25 of relay 7*, and conductor 26 with the .s'trand-twof the. cord circuit. Similarly the low resistance windin 22 of relay 1*? is connected on one side yconductor 2'7 with 'the live pole of the battery B while on the other side it is connected by conductor 28,

-spring 29 and normal contact of relay 1", and

conductor '30, with the sleevestrand sfof said cord circuit. With this arrangement it z a' will be seen that when the relay 7" remains unoperated, the said two low resistance windings of the two relays 1? and 7- are connected on opposite sides of the battery B in a bridge of the answering end of the cord circuit. The high resistance windings of said-relays are connected with one end of the low resistance'windings, and in the case of relay r hasits other terminal connected H by conductor 3l with the'forward contact of spring 25 of 'saidrelay 1', whereby upon the energization .of the latter the conductor 26 is'connected with conductor 31,and the conductor 24 is disconnected therefrom, so

that the whole winding of the saidrelay r is in circuit between the adjacent pole of the Similarly the high resistance wind- I ance winding 23 ofthe relay r between the battery 13' and the strand 8. The forward contact of the spring 29 of this relay r. is connected to ground by conductor 34 through asuitable retardation coil 35, so

that the relay r remains operatedas long as relay 7* is operated. In a similar manner the I windings of the relays r and r are connected with the strands't and s anotherretardation coil 36 being supplied in connection with this end of-the cord circuit. The

relay 0" at this end of the cord circuit is provided with an additional spring 37, connected as shown to the forward portion of strand t? for busy testing purposes, its normal contact being joined by conductor38 -with a suitable test relay or other testing device and its alternate contact being connected with-the rear portion of. the strand 25 The operators set comprising the usual receiver 39, the secondary'of her induction coil 40, and a suitable condenser 0 are adapted to be bridged across the answering end of the cord circuit by the springs 41 of any suitable listening key, while her transmitter 42 and the primary winding of her induction coil are arranged to be charged. from any suitable source of current. A

.ringing generator 43 is adaptedto be connected with the calling plug P bythe operation of the ring ng key springs 44.

The operation of our invention is as fol,- lows: Assuming the subscriber upon the line L to have taken up his receiver, a path forcurrent is' provided over the telephone from conversation.

the battery B, thereby energizing the line relay R andlighting the line signal S Upon observing this signal the operator inserts the answering plug P of her cord circuit into the jack J of the calling line,

thereby permitting current to flow from the live pole of the battery B over conductor 27,

winding 22 of relay 9, conductor 28, spring 29 and back contact of relay 1', conductor 30,

strand 8, sleeve contacts of the plug and jaclr, and then through the cut-ofi relay 'R to the ground, thereby energizing said cutofl' relay and cutting ofi the line relayto retire the "line' signal and to connect the two.

portions of the telephone line together for It will be noticed that the I .third or test contacts 17 of the jacks J 2 are insulated from other parts of the system so that no circuit is completed through the strand (0 of the cord circuit 'and the relay 1',

the fact that the contacts 17 of the jack are therefore, remains denergized, thus perinitting the current .from battery B to continue to fiow in the path just above traced.

At the same time the supervisory relay r is energizedan'd closes-the local circuitiof the supervisory signal 8*, but on account of the subscribers telephone being ofi' its hook said signal is prevented from operation by the actuation of the-companion relay 1, the circuit for the low resistance winding 22 of which is now completed through the conductors. 24 and 26 from the grounded pole of the battery B to the strand t. Under these conditions of use therefore, the battery B furnishes current to the subscribers station for the operation of the transmitter through the low resistance windings 22 of the supervisory relays 7' and 1 The operator is therefore enabled to receive the order for the wanted subscriber.

. Assuming the subscriber upon the line L to be the one desired, the said line is tested in the usualmanner, and if found idle the calling plug P is inserted therein and the ringing key tt depressed. On account of isolated, the relay 7- associated with this end of the'cord circuit remains in its normal the test relay, and also completesthe local circuit of thesupervisory signalS through another spring, and since the subscriber has -not yet responded, and relay r is not yet operatedsaid supervisory signal S is now lighted, indicating to the operator the condition' of the subscriber s telephone. The

testing operation is apparent, that is, if idle, no click is received by the operator when she ;",touches the tip of the plug P to one of the test rings 17, since a complete'circuit is not established; but if busy, a complete circuit is established through the third strand v or o? to the live pole of battery B and a click, would be received, it being understood I thatthe test relay or other device would be grounded. As soon as the plugis inserted in the called line the ringing key 44 is depressed, the calling current passing out over the tip side of the telephone to the substation and back to the central oflice over the sleeve side of the line and through the battery' l3 to ground. During this operation current from the battery B is holding up the cut-off relay R in the usual manner.

Upon the response of'the called subscriber a path for current from the battery 13* is now completed over the telephone line as in the case of line L and the relay 1* is energized to open the local circuit and thereby to retire the supervisory signal S.

The operator is now informed that the subscribers are in communication- Currentfor the two substation transmitters is now ied.

outthrough the ohm windingsof the supervisory. relays in the common manner,

from one circuit to the other by the conwhile the voice currents .are transmitted densers c and 0 Upon the return of the subscribers receivers to their hooks the line circuits are opened and the tip relays r and 1' are deenergized thus closing the cirlcuits of the supervisory lamps-S and S The supervisory relays r and rf as well as the cut-off relays of the lines remain operated, however, over the local pathsbefore described and the supervisory lamps are lighted. Upon observing these the operator takes down the connection and restores all parts to normal condition.

Assuming the calling subscriber to have been located upon the v.line L the operation of his hand generator 10 sends a calling current through thedrop signal S, thereby indicating to the operator that a connection is desired. The operator insertsthe plug P of thesame cord circuit into the jack J, thereby closing the local circuit of the cut-oil? relay R from the battery B, which is energized to cut ofl the signal S and to connect the line conductors 2 and 3 with the springjacks of the line. The operation of the cutoff relay R connects ground with the third contacts 17 of the acks through conductors 18 and 19 and spring 20 of said relay, which establishes a path for currentover the strand '1; of the cord circuit'through the relay 1' f om the live pole of the battery B This relay is therefore energized and results in cutting in both windings of the supervisory relay r and the high resistance winding 2-3 of relay r Current from the battery B therefore lows over the metallic telephone line through said high resistance windings 10.0f relays r and r to suitably control the said relays and thereby the supervisory signal S and at the same time a large current is prevented from flowing in the line which is not only now unnecessary because a local battery 7 is provided to operate the substation transmitter, but would also interfere with the operation of the'receiver at the sub station and would consume undue amount of current. A path for current through the low resistance winding ofrelay r is also now established through conductors 28 and 34;, which it is evident, maintains the same operated as long as the relay r is energized or until the plug P is withdrawn'from the '25 jack. The operator is now enabled to tail:

withthe subscriber to learn his order. As-

suming that the subscriber upon the line L is the one desired, the said line is tested in the ordinary manner, and if found idle, plug P is inserted in one of the multiplejacks thereof, and the-ringing key operated. The relay R of the called line is now operated to cut off the line signal and to connect ground with the jack rings and relay r is energized to complete a path for current through the v, winding 22 of the relay 11 through conductor 28, spring 29 and its forward contact and conductor 84 and through the retardation coil 86 to ground. This relay 1' is 40 therefore operated and closes the local circuitof the signal 8*, which is now lighted owing to the fact that the relay r is not yet operated, and indicates to the operator that the subscriber has not yet responded. As explained in connection with line L this relay 1" remains energized "as long as'the plug is connectedwith the telephone .line.

The strand t is also placed in condition for conversation by the attraction of the spring 37. When the subscriber responds current flows over the metallic line through the two windings ofthe relay T which energizes said relay and retires the supervisory signal 'S. The current flowing upon the line is smallin quantity, due to the high resistance windings 23 of the relays r and 1 During conversation the local batteries of the substations are furnishing the current for the operation of the transmitters. At the termination of the conversation the return of the subscribers receivers to their hooks deenergizes the relays r and r thereby clos .ing the local circuits of the supervisory signals S and S which become lighted and indicate to the operator thatthe conversation same and in practice not more than the two 'been worked out for commercial purposes,

. scope or, principle thereof line for the operation of the transmitter has terminated, when she takes down the cord circuit and restoresall parts. to normal condition. y

The operation of the'devices at thetwo ends of the cord circuit areindependent and. it is obvious that any of the types of lines may be connected-together for conversation. The connection of either end of the cord cir cuit with a common battery line results in feeding current to said line through the low .-75, v resistance windings of the supervisory relays at that end of the'cord circuit due to the fact that the relay in the third stranddoes not operate, and theconnection 'of the other end of the cord circuit with a magneto line 30 results in feeding current thereover through the high resistance windings, due to the fact that the relay in the corresponding third strand of that cord is operated. The voice currents in each instance are transmitted as from onee'nd of the cord circuit to the other and from one line to the other through'the condensers c and 0 The several batteries may be one and the batteries B and B would be employed, al though for testing purposes the battery B may be of less electromotive force. The retardation coils 35 and 36 may be of 500 ohm resistance and the otherparts of the usual or desired electrical dimensions. .Our im provements may be applied to one end only of a cord or, trunk where that would --be desirable.

It is thus apparent that we have provided a cord circuit. for the purposes desired,

which'is comparatively simple, eificient and economical-to install, operate and maintain; and while but one specific form,'which has has been shown and described,- we do not desire to be limited thereto in allrespects as it is obvious that various alterations may be made therein without departing from the We claim: i 1. In a telephone system, the combination with common battery and local battery telephone'lines, of a cord circuit to establish connections therewith for conversation, a central source of current associated with the cord circuit and connected through the limbs thereof with the commonbattery line .to furnish current to the substation of said when the cord is connected therewith, supervisory signals associated with said cord circuit and adapted to be operated by current from said source, and means whereby said cord circuit may be used interchangeably 128 with the local and common battery lines without, in any way altering the operation of the supervisory signals, substantially as described.

-2. Ina telephone system, the combina- 131:

tion with common battery and local battery scribed. 1

. by current in the telephone line, whereby upon the hook and the circuit of the comtypes, a source of direc'tcurrent associated j system associated with the cord circuit conin series and having the same manifestation cord being adapted to connect with each of adapted to be displayed when the conversa circuit connected with the common battery associated with the'cordand adapted to be lines normally open to direct currents at the'substations, of.-a cord circuit adapted for interchangeable use with lines of both with the cord circuit and adaptedto furnish current for the transmitters of the common battery lines, anda .supervisory signaling trolled over the limbs of the talking circuit when the'cord circuit is used with the different kinds of lines, substantially as de- 3. In a telephone system, the combination with' telephone lines of different kinds, of a cord circui't adapted for use with the different kinds of lines, a supervisory signal associated with'the cord circuit controlled over, the limbs of the talking circuit of the telephone line inseries 'and etlaced when differentkinds of lines,- substantially as de lLIn a telephonev system, the combination with a local battery telephone line having a 'hand generator at the substation adapted tobe connected in series with the limbs of the telephone line'while in use, of a co'mmon'battery line having a switchhook adapted to open the circuit of the telephone line when the receiver is on the hook,-'a cord 7 circuit adapted to connect said lines together for conversation, each end of said saidlines depending upon whether the line 1s a called or a calling line, a signal associated with each end of said cord clrcult and tion is terminated, the signal of the end of the cord circuit connected with the local bat: tery line being displayed independent of the operation of said hand generator, the signal associated with the end of the cord telephone line being adapted to be controlled said signal is displayed when the receiver of the common battery substation is placed mon battery line is open at the substation, substantially as described.

5. In a telephone system, the combination with common battery and local battery telephone lines, of a cord circuit to be used with both kinds of lines, a common battery suitably connected with the first type of lines to furnish current thereover for the operation of the substation transmitters, supervisory signals associated with said cord circuitand adapted to be displayed by current from said common battery, and means whereby when the cord is connected with the local battery lines the current from said 6. In a telephone system, the com bination with common battery and local battery telephone lines, of a cord circuit adapted for connection between either different or like lines, acentral source of current adapted .to be" suitably connected with the common battery lines to furnish current thereover for the operation of the substation transmitters, a supervisory signal associated with the cord and controlled during conversation with a local battery line by a relay actuated over the telephone .line by current 'from. said source flowing over the telephone line,

and means whereby when. the cord is .connected with the local battery lines the said supervisorysignal is operatedin the same manner as with the common battery lines and current from the said source flows ,on the line sufficiently to control said signal but does notfiow to an objectionable degree,

7 In a telephone system, the-combination with common battery and local battery telephone lines, of a. cord circuit adapted for connection between either different or like lines, a central source of current'adapted to be suitably connected with the common battery lines to furnish current thereover for the operation of the substationtransmitters,

a supervisory signal associated with the cord -phone line, and means whereby when the cord is connectedwith the local battery lines the supervisory signal is operated in the same manner-as with the common battery lines and the current flowing in the line from said sourceis reduced but still flows,

sufficiently for the control of said signal, substantially as described.

8. In a telephone system, the combination with common battery and local battery telephone lines, of a cord circuit and a source of current associated therewith, to furnish current to the substation transmitters, super-' visory-signal-controlling electromagnets associated with the cordcircuit through which current is fed to the substations, and means for cutting down the current through said magnets when the cord is connected with the local batterylines whereby the current from the latter is reduced and the said magnets are still suitably operated for supervisory purposes, substantially as described.

.9. In a telephone system, the combination with common battery and local battery telephone lmes, of a cord circuit and a source of current associated therewith, to furmsh cur rent to the substation transmitters, super- I 'isory-signal-controlling electromagnets asstill operated in the same manner for super-' visory purposes, substantially as described.

10. In a telephone system, the combination with common battery and local battery telephone lines, of a cord circuit and a sourceof current associated therewith, to furnish current to the substation transmitters, supervisory-signal-controlling electromagnets as-1- sociated' with the cord circuit through which current is fed to the substations, means for including a resistance in the circuit of said magnets when connection isestablished with local battery lines to cut downthe current on such lines, the said magnets being still operated in the same vmanner for supervisory purposes, and a'highresistance coil on the said magnets cut into the circuit thereof when connection is established with local battery lines, substantially as described.

11. In a telephone system, the combination with common and local battery telephone lines, of a cord circuit to connect said lines together for conversatlon, relays associated with saidv cord c1rcu1t, supervisory signals associated with said relays, and means whereby said relays will cooperate in a different manner tov control said super yisory signals when the cord is connected to a local battery line from that in which they cooperate when thecord is connected to a common battery line, substantially as dey scribed.

12. In a telephone ,system,.the combina 'tion with/common: and local battery telephone lines normallyiopen to direct currents at the substations, ,of a cord circuit to connect said lines together for conversation, relays jassociated with'said cord circuit, supervisory 'sign'als associated with said relays,

and similarly displayed when the cord is connected either to a common or a local battery line, the signal for. each end of the cord circuit being controlled over the talking strands in series of the line connected with that end of the cord circuit, substantially as described.

Signed by us at Chicago, county of Cook, 3

State of Illinois, in the presence of two witnesses.

EDWIN H. RUPE.

' Witnesses ROBERT LEWIS AMEs, EDITH FL GRIER.

' CHARLES S. WINSTON. 

